Hammer head



FIG. 1 is a top view.

FIG. 2 is a left side view, the right side view being a mirror image thereof.

FIG. 3 is a bottom view.

FIG. 4 is a front view.

FIG. 5 is a rear view; and,

FIG. 6 is a front perspective view, wherein the broken line showing of the handle is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a hammer head, as shown and described. 